1143809 has 2 divisors, whose sum is σ = 1143810. Its totient is φ = 1143808.

The previous prime is 1143803. The next prime is 1143817. The reversal of 1143809 is 9083411.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1056784 + 87025 = 1028^2 + 295^2 .

It is an emirp because it is prime and its reverse (9083411) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1143809 - 2¹² = 1139713 is a prime.

It is not a weakly prime, because it can be changed into another prime (1143803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571904 + 571905.

It is an arithmetic number, because the mean of its divisors is an integer number (571905).

2^1143809 is an apocalyptic number.

It is an amenable number.

1143809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143809 is an equidigital number, since it uses as much as digits as its factorization.

1143809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1143809 is about 1069.4900654050. The cubic root of 1143809 is about 104.5806097959.

The spelling of 1143809 in words is "one million, one hundred forty-three thousand, eight hundred nine".